Last week my guinea pig was "popcorning" and he squeaked in pain and was suddenly limping on his back leg (dragging it around). He slowly got better but now, a week later, he isn't walking on the leg again.

Has anyone known a guinea pig to have injured their leg popcorning (jumping) around the cage?

I'm super worried about him since he seemed to make a full recovery but it now back at square one.

I have moved the water and food close to him so he doesn't have to walk around to get things.